ProfessorPain
First Post
A better example might be "Tar Baby". It has been used as a slur quite often. However, it is also descriptive of something that you touch and you now can't get off, because you're stuck to it.
So politicians/radio disk jockies have gotten in trouble for using the term correctly, even though it is still associated with a racial epithet.
But both are deemed offensive when used to refer to a person, because it is very difficult to distinguish how it is being used. Both are supposed to be acceptable when used to refer to objects or concepts. However, I think tar baby is a word that is becoming more charged, and it is increasingly viewed as offensive even when used to describe a thing and not a person. Most slurs have "correct" uses as well. But that doesn't make them any less offensive when used to describe people.